﻿// Copyright 2013-2020 Dirk Lemstra <https://github.com/dlemstra/Magick.NET/>
//
// Licensed under the ImageMagick License (the "License"); you may not use this file except in
// compliance with the License. You may obtain a copy of the License at
//
//   https://www.imagemagick.org/script/license.php
//
// Unless required by applicable law or agreed to in writing, software distributed under the
// License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
// either express or implied. See the License for the specific language governing permissions
// and limitations under the License.

namespace ImageMagick
{
    /// <summary>
    /// The normalized moments of one image channels.
    /// </summary>
    public interface IChannelMoments
    {
        /// <summary>
        /// Gets the centroid.
        /// </summary>
        PointD Centroid { get; }

        /// <summary>
        /// Gets the channel of this moment.
        /// </summary>
        PixelChannel Channel { get; }

        /// <summary>
        /// Gets the ellipse axis.
        /// </summary>
        PointD EllipseAxis { get; }

        /// <summary>
        /// Gets the ellipse angle.
        /// </summary>
        double EllipseAngle { get; }

        /// <summary>
        /// Gets the ellipse eccentricity.
        /// </summary>
        double EllipseEccentricity { get; }

        /// <summary>
        /// Gets the ellipse intensity.
        /// </summary>
        double EllipseIntensity { get; }

        /// <summary>
        /// Returns the Hu invariants.
        /// </summary>
        /// <param name="index">The index to use.</param>
        /// <returns>The Hu invariants.</returns>
        double HuInvariants(int index);
    }
}